Improvement in electro-magnetic machines



BURNAP 81. BRADSHAW.

Magneto-electric Machine.

I No. 23,214. Patented Mar. 8, 1859.

ammo Z %%w@.

UNITED STATES PATENT OEEIcE.

W. H. BUR-NAP AND JNO. A. BRADSHAW, OF LOWELL, MASSACHUSETTS, ASSIGNORS TO W. H. BURNAP.

IMPROVEMENT IN ELECTRO-MAGNETIC MACHINES.

Specification forming part of Letters Patent No. 23,214,. dated March 8, 1859,

To all whom it may concern:

Be it known that we, W. H. BURNAP and JOHN A. BRADSHAW, both of Lowell, in the county of Middlesex and State of Massachusetts, haveinvented a newand Improved Speed- Regulator for Magneto-Electric Machines; and we do hereby declare that the following is a full, clear, and exact description of the same, reference beinghad to the accompanying drawings, forming part of this specification, in which- Figure 1 is a front elevation of a magnetoelectric machine with our regulator applied. Fig. 2 is a plan view of the same machine.

Similar letters of reference denote like parts in both figures.

This invention consists in a certain novel and very simple and effective mode of applying an oscillating balance-wheel, in cdmbination with a train of gearing actuated bya spring, for driving a magneto-electric machine, whereby the velocity of the rotary motion of and the strength of the current produced by the machineare rendered uniform or nearly so throughout the whole of the time the spring is running out.

To enable others to make and use our invention, we will proceed to describe its construction and operation.

A is the box in which the magneto-electric machine is inclosed. B B is the framing of the machine, containing the bearings of the helix-shaft a, and the shaft 1) of the spring box or barrel, and all the shafts of the train-of gearing between the said shafts. The train of gearing requires noparticular description, as it may be varied.

G is a disk secured to a shaft, 0, which derives rotary motion from the train at a suitable speed. This disk carries awrist-pin, d, which is connected by a rod, 6, with a pin, 2 secured in a forked arm, f, which is attached to a short rock-shaft, g, which works in a bearing in a plate, It, secured to the framingB B. The distance of the pin 2' from the center of the rock-shaft g is so much greater than the distance of the wrist-pin d from the center of the shaft 0 that the arm f derives from the revolution of the wrist-pin an oscillating motion of about one-tenth or more or less of a circle in its sweep. Y

D is the balance-wheel, the shaftj of which is behind, but in line with, the rock-shaft g, and which is supported partly in a bearing in the frame B B, and partly by having a female center in one end fitted to a male center on the rear end of the rock-shaft This balancewheel has its hub connected with the armf by means of a convolute spring, 7;, of similar character to the hair-spring of a watch or balancespring of a clock.

The operation of the regulator is as follows: The arm f, deriving areciprocatingmotion from the train of gearing, as hereinbefore stated, imparts an oscillating motion to the balancewheel through the agency of the spring is but the moment of inertia of the balance-wheel, acting upon the arm f through the spring 7, causes more or less back-pressure against the arm f, according as the tendency of the said arm is to move faster or slower, and hence acts with greater effect when the spring is strong est, and tends to move the train of gearing and the helix-shaft the fastest, thereby tending to equalize the velocity of revolution and the strength of the current produced by the rotation of the poles of the helix in proximity to the poles of the magnet M.

VVha-t we claim as ourinvention, and desire to secure by Letters Patent, is-

Applying the oscillating balance-wheel D, with its shaft 9', inline with, but detached from, a rock-shaft, g, or its equivalent, carrying an arm, f, which derives a positive oscillating movement from the train of gearing which drives the magneto-electric machine, and conmeeting the spring k, which is attached to said balance-wheel, with the so arranged positivelymoving arm, substantially as and for the purpose herein specified.

W. H. BURNAP. JOHN A. BRADSHAW.

Witnesses CHARLES PAGE, ATIS Oseoon. 

